SORBS?!

Hello,
Is anyone from SORBS still listening? We have a few IP addresses here
and there that are listed, one in particular that has been for a spam
incident from over a year ago. The "last spam" date is 03/05/2011
according to their lookup tools.
We don't have access to their Net Manager even if our ARIN POC
corresponds to the account on their system we opened a while ago. We
use their ISP feedback form and never get any responses back.
Is SORBS still relevant and functional?
Sincerely,
Chris Conn
B2B2C.ca